1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2017 Free Electrons
4  * Copyright (C) 2017 NextThing Co
5  *
6  * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18 
19 #include <linux/mtd/rawnand.h>
20 
hynix_nand_decode_id(struct nand_chip * chip)21 static void hynix_nand_decode_id(struct nand_chip *chip)
22 {
23 	struct mtd_info *mtd = nand_to_mtd(chip);
24 
25 	/* Hynix MLC   (6 byte ID): Hynix H27UBG8T2B (p.22) */
26 	if (chip->id.len == 6 && !nand_is_slc(chip)) {
27 		u8 tmp, extid = chip->id.data[3];
28 
29 		/* Extract pagesize */
30 		mtd->writesize = 2048 << (extid & 0x03);
31 		extid >>= 2;
32 
33 		/* Extract oobsize */
34 		switch (((extid >> 2) & 0x4) | (extid & 0x3)) {
35 		case 0:
36 			mtd->oobsize = 128;
37 			break;
38 		case 1:
39 			mtd->oobsize = 224;
40 			break;
41 		case 2:
42 			mtd->oobsize = 448;
43 			break;
44 		case 3:
45 			mtd->oobsize = 64;
46 			break;
47 		case 4:
48 			mtd->oobsize = 32;
49 			break;
50 		case 5:
51 			mtd->oobsize = 16;
52 			break;
53 		default:
54 			mtd->oobsize = 640;
55 			break;
56 		}
57 
58 		/* Extract blocksize */
59 		extid >>= 2;
60 		tmp = ((extid >> 1) & 0x04) | (extid & 0x03);
61 		if (tmp < 0x03)
62 			mtd->erasesize = (128 * 1024) << tmp;
63 		else if (tmp == 0x03)
64 			mtd->erasesize = 768 * 1024;
65 		else
66 			mtd->erasesize = (64 * 1024) << tmp;
67 	} else {
68 		nand_decode_ext_id(chip);
69 	}
70 }
71 
hynix_nand_init(struct nand_chip * chip)72 static int hynix_nand_init(struct nand_chip *chip)
73 {
74 	if (!nand_is_slc(chip))
75 		chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
76 	else
77 		chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
78 
79 	return 0;
80 }
81 
82 const struct nand_manufacturer_ops hynix_nand_manuf_ops = {
83 	.detect = hynix_nand_decode_id,
84 	.init = hynix_nand_init,
85 };
86